North Korea has completed preparations for another nuclear test, South Korea's Yonhap News Agency reported on Monday, citing South Korean government sources who said the North may use a previously unused tunnel at its mountainous test site.

The United States may launch unilateral sanctions against North Korea, a US special envoy for the isolated state said on Sunday, two days after it carried out its fifth and biggest nuclear test in defiance of UN sanctions.
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North Korea conducted its fifth and biggest nuclear test on Friday and said it had mastered the ability to mount a warhead on a ballistic missile, ratcheting up a threat that rivals and the United Nations have been powerless to contain.

North Korea is "likely" to have conducted a nuclear test on Wednesday that caused an earthquake near a known testing site in the isolated country, the South Korean and Japanese governments said.
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Six world powers demanded Iran keep its promise to let international inspectors visit a military installation where the UN nuclear watchdog believes explosives tests geared to developing atomic bombs may have taken place.
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